Best compression gauge
 

What kind of compression gauge does everyone have? I'm looking for a new one, but I want one thats as close to spot on as possible. Ive read that a lot of the compression gauges on the market fluctuate and wont all give the same readings.

If you have a few bits of plumbing and adapters laying around, as well as a pressure gauge you already trust, you can verify for yourself and make a calibration table if there are any differences from the reference gauge.